Police have not yet identified a man whose body was pulled from the Potomac River on Friday afternoon.

Fire and rescue units responded to the area of Swains Lock near Great Falls Park at approximately 12:44 p.m. They located and recovered the body, described by police as a white male in his late teens or early 20s.

According to police, witnesses on the Fairfax side of the Potomac River observed a male subject enter the river south of Riverbend Park in Fairfax County, and contacted 911.

The male is believed to have waded into the middle of the river and drowned after having become trapped under a rock, police said.

Montgomery County detectives are working with Fairfax County authorities regarding the identity and the circumstances surrounding the subject entering the water. At this time, foul play is not suspected. The Office of the Chief Medical Examiner will determine the identity of the body.

Anyone with information about this drowning is asked to contact Homicide/Sex detectives at 240-773-5070. Callers may remain anonymous.